/** @format */

// Color and theming utility functions! Handy.

// Graciously stolen from https://stackoverflow.com/a/54071699! ::::)
// in: r,g,b in [0,1], out: h in [0,360) and s,l in [0,1]
export function rgb2hsl(r, g, b) {
  let a = Math.max(r, g, b),
    n = a - Math.min(r, g, b),
    f = 1 - Math.abs(a + a - n - 1);
  let h =
    n && (a == r ? (g - b) / n : a == g ? 2 + (b - r) / n : 4 + (r - g) / n);
  return [60 * (h < 0 ? h + 6 : h), f ? n / f : 0, (a + a - n) / 2];
}

export function getColors(primary) {
  const [r, g, b] = primary
    .slice(1)
    .match(/[0-9a-fA-F]{2,2}/g)
    .slice(0, 3)
    .map((val) => parseInt(val, 16) / 255);
  const [h, s, l] = rgb2hsl(r, g, b);
  const dim = `hsl(${Math.round(h)}deg, ${Math.round(s * 50)}%, ${Math.round(
    l * 80
  )}%)`;
  const bg = `hsla(${Math.round(h)}deg, ${Math.round(s * 15)}%, 12%, 0.80)`;

  return {
    primary,
    dim,
    bg,
    rgb: [r, g, b],
    hsl: [h, s, l],
  };
}
